No, players can only delete messages from their own walls in the game.
Originally Posted by dehbaker
Such a great info and thread but I have a question - does anyone know the exact amount of messages you can have on your wall? Because I have important messages (from several years ago aswell) from my nbrs/community members that doesn’t play anymore and I’d like to have them saved on my wall; so when somebody posts I visit them right back and delete the messages (by doing this I know I visited them back). So again, someone know the exact number? Thank you guys (I’ve read now someone posted here that it can be around 100 but I don’t think that much)